JP2006225944A - Cap for strut of protection fence - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cap for a strut capable of being mounted on the existing strut in a pressing state and, at the same time, corresponding to variations in an outside air temperature. <P>SOLUTION: In the cap 1 for the synthetic resin made-strut constituted by integrally forming an upper surface section 11 closing the upper end Pa of the cylindrical strut P supporting a protection fence G and a circular side section 12 put on the outer circumferential surface Pb in the vicinity of the upper end of the strut, it is constituted by having a plurality of ribs 21 to 26 with a predetermined height while making it as a radial shape toward the circumferential edge from the central neighborhood of the back 11a of the upper surface section. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cap that is attached to the tip of a support provided to support a guard fence such as a guard rail, a guard pipe, or a guard rope.

  In general, a guard fence such as a guard rail, a guard pipe, or a guard rope is configured by providing support columns at appropriate intervals, and spanning rails, pipes, and the like on the support columns. Since the pillar of such a protective fence is usually composed of a cylindrical pipe, a cap is provided to cover the opening at the upper end. The reason is that a fixing member for fixing the rail or pipe to the support column is provided inside the support column or a fixing member that penetrates the support column is used. This is to protect the fixing member from wind and rain.

  This kind of guard fence cap was originally made of metal. The reason for this is that since the support is made of metal, it can be welded by being made of the same kind of material as this, and it can be firmly attached, and mechanical fixing means such as rivets can be used. This is because easy and strong mounting can be performed. However, these fixing methods using welding or rivets have been studied so as to have a structure in which the work is complicated and workability is poor and can be easily mounted (see Patent Documents 1 to 3).

By the way, as described above, when the cap can be easily installed, it is naturally easy to remove the cap. In the protective fence used on the shoulder of the road, the cap can be used in a collision accident caused by a vehicle or the like. It has been pointed out that there is a possibility that only the vehicle will be separated from the column and this may hit the vehicle, the driver, or a nearby pedestrian. Therefore, proposals have been made to make the entire cap made of synthetic resin (see Patent Documents 4 to 6).
Japanese Examined Patent Publication No. 53-8197 (1 page, FIG. 1 to FIG. 4) Japanese Utility Model Publication No. 60-18127 (page 1-2, FIG. 1 to FIG. 3) Japanese Patent Laid-Open No. 8-100406 (pages 2 to 3 and FIG. 1) Japanese Utility Model Publication No. 5-75357 (page 4-5, FIG. 1) Japanese Utility Model Publication No. 7-38216 (2 pages) Japanese Patent Laid-Open No. 10-60845 (page 2, FIG. 1)

  The synthetic resin cap as described above, for example, uses a metal material such as a leaf spring in order to obtain a fixing force with the support, as described in Patent Document 4. Moreover, as described in Patent Document 5, there is a configuration in which a support plate portion for ensuring stability at the time of mounting the cap is provided inside the cap. However, these support caps require leaf springs and support plate parts, which complicates the processing of the caps. Also, it is necessary to fix the plate springs and support plate parts even when the caps are mounted. It was never easy to put on.

  Therefore, recently, synthetic resin caps that have a tight fitting tolerance of the side surface portion of the cap with respect to the support column have become mainstream. This is simply a metal so-called overcap form made of synthetic resin and intended to prevent the cap from coming off when the back of the side of the cap is in close contact with the outer peripheral surface of the upper end of the column. is there. According to such a cap, since the cap is originally made of a synthetic resin, even if the cap is detached from the support column at the time of collision of the vehicle or the like, and this directly hits the vehicle or the pedestrian or the like, the impact at that time is small. Therefore, it is expected that the influence on the vehicle and the human body is expected to be small, and that the cap in a state where it is pressure-bonded due to the fitting tolerance is not easily detached.

  However, when the side surface of the cap is in close contact with the column, the inside of the column is hermetically sealed. Therefore, the expansion or contraction of the internal air occurs due to a change in the outside air temperature. Or negative pressure was to act. And, for example, when an extremely large positive pressure is applied due to extreme heat, the cap was expected to be detached from the support column. Conversely, when an extremely large negative pressure is applied due to, for example, severe cold, the cap may be deformed. And the deformation | transformation of this cap repeated, and the adhesive force with respect to a support | pillar will fall.

  Patent Document 6 describes a technology in which a leg portion and a locking portion are formed on the entire circumference of the cap and locked to the opening end of the support column by the locking portion. The end must be processed into a special shape (the tip is drawn), and in a cylindrical column that is already used or planned to be used, it cannot be handled by replacing only the cap. .

  The present invention has been made in view of the above-described points, and an object of the present invention is to provide a cap for a column that can be attached to an existing column in a crimped state and can cope with a change in outside air temperature. That is.

  Therefore, in order to achieve the above object, the invention according to claim 1 is a ring-shaped device mounted on an upper surface portion that closes an upper end of a cylindrical column that supports a protective fence and an outer peripheral surface near the upper end of the column. A synthetic resin support cap made up of a side part and a plurality of ribs having a predetermined height while radiating from the vicinity of the center of the back surface of the upper surface part toward the periphery. The gist of the cap for the support fence of the protective fence is characterized by this. The cross-sectional shape of the rib in the above may be a polygon other than a triangle.

  With the configuration as described above, the upper surface portion of the cap is reinforced with ribs, and the ribs are provided radially, so that the ribs approach each other near the center of the upper surface portion, and the strength near the center of the upper surface portion. Will be improved. Also, by changing the protruding height of the rib, it is used for the cap of the column by increasing the protruding height of the rib where the strength is required according to the shape of the cap, especially the shape of the upper surface. It can be set as the structure which can do.

  Further, it is possible to reinforce when the upper surface of the cap is substantially spherical. In other words, the support cap having a substantially spherical upper surface is configured to have an appearance as a general support for the support, but by utilizing the back surface of the upper surface, the protrusion height of the rib is changed. A suitable rib can be formed on the back surface of the upper surface portion. Further, the ribs provided radially on the back surface of the upper surface portion formed in a substantially spherical surface can give equal strength to the entire upper surface portion.

  The invention according to claim 2 is the cap for struts according to claim 1, wherein the thickness of the upper surface portion is gradually changed from the vicinity of the center toward the periphery, and the vicinity of the center is made thicker than the periphery. It is the structure made into the upper surface part which becomes.

  With such a configuration, in addition to the reinforcing effect of the upper surface portion by the rib, the strength of the upper surface portion itself can be improved. Further, since the portion close to the side surface portion has sufficient strength, the amount of the material used can be reduced by forming it thin.

  According to a third aspect of the present invention, in the cap for a support according to the first or second aspect, the rear surface of the side surface portion includes a protrusion having an appropriate length and a protrusion height and / or at least one groove. It is to be configured.

  According to the configuration in which the protruding portion is provided among the above, in addition to the fact that the upper surface portion can have sufficient strength as described above, when the cap according to the present invention is attached to the column, the protruding portion is the outer surface of the column. A gap is formed between the front surface and the back surface of the side surface portion, and this gap enables air to flow inside the column. The shape of the protruding portion is not specified, but preferably the cross-sectional shape can be a triangle, and the shape as shown in FIG. As described above, while allowing the air inside the column to flow, even if the air inside the column is in a sealed state, the upper surface portion has sufficient strength. Can be prevented.

  In addition, according to the configuration provided with the groove portion among the above, it becomes possible to flow the air inside the support column by the groove portion of the side surface portion, while temporarily preventing the generation of the negative pressure and the positive pressure generated inside the cap, Even when these pressures are applied, the upper surface of the cap can be prevented from being deformed. Further, by increasing the surface area of the back surface of the side surface portion that comes into contact with the outer peripheral surface of the support column, the mounting state with the support column can be stabilized.

  Furthermore, if both the protruding portion and the groove portion are provided, the back surface of the side surface portion of the cap attached to the support column may be in contact with the surface of the support column by either or both of the protruding portion and the groove portion. It is possible to configure a gap through which air can flow, and to secure the inflow and outflow of air inside the support column.

  The invention described in claim 4 is the invention described in any one of claims 1 to 3, wherein the synthetic resin is a fluororesin.

  By adopting such a configuration, there is almost no deterioration due to ultraviolet rays over a long period of time, and when used for a cap of a protective fence post installed outdoors, dust and the like can be easily removed, and the appearance of the post Can be improved. Furthermore, when the support for the support having a configuration in which the protrusion is provided on the back surface of the side surface portion is made of fluororesin, the back surface of the side surface portion comes into contact with the surface of the support due to appropriate creep phenomenon and contraction of the side surface portion, and In addition, it is possible to maintain the abutting force on the column surface by the entire side surface portion. Therefore, before creep deformation, it can be expected that the cap mounting state will be stabilized by the restoring force due to elastic deformation of the side surface portion and by improving the adhesion of the back surface of the side surface portion after creep deformation. it can.

  According to the present invention, since the strength of the upper surface portion is increased by the rib provided on the back surface of the upper surface portion of the cap, even if the inside of the support column is sealed, the air inside the support column expands or contracts due to a change in the outside air temperature. Sometimes, it can withstand positive pressure or negative pressure acting on the cap, and deformation of the upper surface portion of the cap can be prevented.

  In addition, by providing a protrusion or groove on the back surface of the side surface portion of the cap, a slight gap can be formed between the back surface of the side surface portion and the column, and the internal space of the column can be sealed. Therefore, deformation of the cap can be prevented. Thereby, the positive pressure due to the expansion of the air inside the support in summer can be eliminated, and the cap can be prevented from being detached due to the action of the extreme positive pressure.

  Furthermore, as described above, the upper surface portion of the cap has a strength that can withstand deformation by adjusting the rib or thickness, so that even when the gap provided by the protruding portion or the groove portion is clogged. The cap can be prevented from being deformed. In particular, during severe cold, it is expected that freezing that closes the gap due to snowfall or the like will occur, but even in such a case, deformation of the cap can be prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The support cap for a support according to the present invention is attached to a support for supporting a protective fence, and FIG. 1 schematically shows the configuration thereof. As shown in FIG. 1, a support cap 1 according to the present invention is attached to the upper end of a support P used for a guard fence such as a guardrail G. This kind of support | pillar P is formed in the metal cylinder shape, and the inside becomes a hollow structure. Accordingly, the support cap 1 is composed of an upper surface portion 11 and a side surface portion 12, and the upper surface portion 11 is formed in a substantially dome shape so that the upper end (opening end) Pa of the cylindrical support column P can be closed. The side surface portion 12 is formed in an annular belt shape. The side surface portion 12 is a portion that comes into contact with the outer surface Pb of the support column P, and is configured such that the fitting tolerance of the inner diameter size of the side surface portion 12 with respect to the outer diameter size of the support column P is tightly fitted. When the cap 1 is mounted, the back surface of the side surface portion 12 comes into contact with the outer surface Pb of the support column P while being pressed.

  Therefore, an embodiment of the present invention will be described with reference to FIG. 2A is a perspective view of a state in which the cap 1 is turned upside down so that the back surface 11a of the upper surface portion 11 faces upward, and FIG. 2B is a cross-sectional view taken along the line IIB-IIB of FIG. As shown in FIG. 2A, a plurality of ribs 21 to 26 are provided on the back surface (hereinafter referred to as the top surface back surface) 11 a of the upper surface portion 11, and the longitudinal directions of the ribs 21 to 26 are as follows. The upper surface portion 11a has a radial shape from the center 13 to the peripheral edge 14 of the back surface 11a. The tips of the ribs 21 to 26 are configured to reach the peripheral edge 14. Further, the protruding height of the ribs 21 to 26 is appropriately adjusted according to the shape of the upper surface portion back surface 11a.

  In the present embodiment, the protruding heights of the ribs 21 to 26 in the present embodiment are different between the vicinity of the center and the periphery of the upper surface rear surface 11a as shown in FIG. . In other words, the protruding height of the portion at the substantially center 13 of the upper surface rear surface 11a is increased so as to gradually decrease toward the peripheral edge 14. Specifically, the upper surface portion 11 of the present embodiment is configured to have a substantially spherical shape that bulges outward (toward the front surface side), and accordingly, the upper surface portion back surface 11a also forms a substantially spherical surface. ing. Therefore, the upper edge of the ribs 21 to 26 is curved along the substantially spherical upper surface back surface 11a, while the lower edge forms a chord with respect to the arc-shaped cross section of the substantially spherical upper surface back surface. It is linear in the direction, and the middle of these upper and lower edges is adjusted as the protruding height of the ribs 21-26.

  Thus, by providing the ribs 21 to 26 having different protruding heights on the upper surface rear surface 11a, in particular, by increasing the protruding height around the center 13, the upper surface portion 11 formed in a substantially spherical surface is the most. The periphery of the center 13 that is easily deformable can be reinforced, and even when the internal air of the support column P (FIG. 1) is cooled and a negative pressure acts on the cap 1, the upper surface portion 11 is deformed. Will be maintained.

  Moreover, in the said embodiment, as shown in FIG. 3, it can be set as the structure which changes the thickness of the upper surface part 11. As shown in FIG. In this case, it can be configured such that the substantially center 13 of the upper surface portion 11 is thickest and gradually becomes thinner toward the peripheral edge 14. In this embodiment, when the diameter of the upper surface portion 11 is 140 mm, the thickness at the center 13 is 2.5 mm, and the thickness at the peripheral edge 14 is 1.5 mm, so that the strong upper surface portion 11 is configured. Yes. Here, the upper surface portion 11 has a front surface 11b having a substantially spherical shape and a back surface 11a also having a substantially spherical shape. By changing the radius or the center point of each spherical surface, Is to change.

  Thus, in the upper surface part 11 provided with the ribs 21 to 26, the upper surface part 11 is very strengthened by changing the thickness of the upper surface part 11. That is, since the thickness of the upper surface portion 11 is thick at the center 13, the strength against bending stress is imparted, and when the upper surface portion 11 is curved, the ribs 21 to 26 are subjected to bending stress and compressive stress. Although acting, since the protruding height of the ribs 21 to 26 is large at the center 13, the ribs 21 to 26 can withstand the stresses described above. Further, since the ribs 21 to 26 are radially formed on the substantially spherical upper surface portion back surface 11a, the plurality of ribs 21 to 26 are concentrated at substantially the center 13 thereof (see FIG. 2). Thus, the center 13 of 11 can be constructed more strongly.

  Next, a more preferable example of the above embodiment will be described. The form is shown in FIG. In this embodiment, as in the above-described embodiment (FIG. 2), ribs 21 to 26 are provided radially on the upper surface rear surface 11a. Further, as shown in FIGS. Projections 31 to 36 are provided on the back surface 12a of the portion 12 (hereinafter referred to as the side surface back surface). The protrusions 31 to 36 are configured independently of the ribs 21 to 26, but may be configured to be continuous with the tips of the ribs 21 to 26 as illustrated. In this case, the ribs 21 to 26 are provided so that the edge of the side surface portion 12 becomes the end point, starting from the peripheral edge 14 of the upper surface portion 11 where the tips of the ribs 21 to 26 are located. Each of the projecting portions 31 to 36 is configured with a projecting height of the same degree. Moreover, the protrusion parts 31-36 are arrange | positioned in the state which has a space | interval suitably in the circumferential direction of the side part back surface 12a, when providing continuously to the ribs 21-26 as mentioned above. That is, as shown in the figure, when the ribs 21 to 26 are configured by six pieces, the projecting portions 31 to 36 are also configured by six pieces, and have an interval that divides the side surface portion rear surface 12a into six equal parts in the circumferential direction. It will be arranged.

  By the way, as for the said form, the whole upper surface part 11, the side part 12, the ribs 21-26, and the protrusion parts 31-36 are integrally comprised with the fluororesin, and the protrusion parts 31-36 are suitably set as mentioned above. The protrusions 31 to 36 come into contact with the outer surface Pb (FIG. 1) of the support P because the side surface 12 is crimped to the support P (FIG. 1). Due to an appropriate creep phenomenon of the resin, the back surface 12a of the side surface portion 12 where the protruding portions 31 to 36 are not provided comes into contact with the outer surface Pb of the support column P over time. At this time, the contact force of the side surface rear surface 12a with respect to the support surface Pb is maintained by contraction of the fluororesin.

  Therefore, when the cap 1 is attached to the support P, only the protruding end edges of the protrusions 31 to 36 come into contact with the outer surface Pb of the support P. This is because a large area of the side surface 12a comes into contact with the outer surface Pb of P.

  According to the above configuration, as shown in FIG. 5A, when the cap 1 is attached to the support P, first, the protruding end edges of the protrusions 31 to 36 abut against the outer surface Pb of the support P, The side surface rear surface 12a located in the periphery forms a predetermined gap with the outer surface Pb of the support column P. By creating this gap, it is avoided that the internal space of the column P is sealed, and the internal air of the column P can flow to the outside.

  Here, when the cap 1 is initially attached, the protrusions 31 to 36 are pressure-bonded to the outer surface Pb of the support column P, and the side surface portion 12 is slightly elastically deformed, so that the support column surface Pb with respect to the protrusions 31 to 36 is concerned. Therefore, it is possible to prevent detachment by the pressing force of the projecting portions 31 to 36. Thereafter, the side surface portion 12 is appropriately creep-deformed with the passage of time, so that the side surface portion back surface 12a partially abuts against the column surface Pb in addition to the protruding portions 31 to 36, and the shrinkage is sufficient. Since the contact force is maintained, the cap 1 is prevented from being detached. Thus, even if it is a case where the back surface 12a of the said side surface part 12 contact | abuts to the support | pillar surface Pb because the side surface part 12 carries out creep deformation, the protrusion parts 31-36 exist in the said side surface part back surface 12a. In the vicinity of the protrusions 31 to 36, the side surface 12a does not come into contact with the support surface Pb, and the state shown in FIG. 5 allows the internal air of the support P to flow between the outside. It is maintained.

  Also in the form as described above, the thickness of the upper surface portion 11 can be changed. That is, as shown in FIG. 5B, the ribs 21 to 26 and the protruding portions 31 to 36 are configured as described above, and the wall thickness of the center 13 of the upper surface portion 11 is the thickest, and the peripheral edge 14 It is configured so that it gradually becomes thinner toward the end. The configuration of the upper surface portion 11 is the same as that in the above-described embodiment (FIG. 3), and is configured by a substantially spherical surface 11b and a substantially spherical back surface 11a.

  In addition, in the said form, since the protrusion part 31-36 of the side part back surface 12a is made into the state pressed by the outer side surface Pb of the support | pillar P in the mounting state of the said cap 1, the outer diameter D (FIG. 5 (a)), the projecting heights of the projecting portions 31 to 36 are adjusted so that the virtual inner diameter dimension formed by the tips of the projecting portions 31 to 36 is a tight fit. Moreover, if creep deformation of the side surface portion 12 is assumed, the inner diameter of the side surface portion 12 is set in consideration of elastic deformation of the side surface portion 12. For example, if the inner diameter of the side surface portion 12 is adjusted to such an extent that the fitting tolerance with the support column P is a loose fit, the elastic force of the side surface portion 12 is used before the creep deformation, and the creep deformation of the side surface portion 11 is also performed. Later, the cap 1 can be prevented from being detached by utilizing the contractility.

  5A, when the cap 1 is mounted on the column P, a ventilation portion is formed between the column P and the cap 1 with a predetermined gap. be able to. And since this ventilation part opens in the edge 15 of the side part 12, when attaching the cap 1 to the front-end | tip of the support | pillar P generally standing in the perpendicular direction, the opening of the said ventilation part turns downward. And since the opening position becomes the lower rank of the whole cap 1, even if rain water, water on a road, etc. are bathed in the cap 1, it can suppress entering the inside of the support | pillar P. FIG. Furthermore, since dust or dust does not enter, a suitable mounting state of the cap 1 can be maintained.

  In addition, in the structure which provides the protrusion parts 31-36 among each said form, it can be set as the form which provides the said protrusion parts 31-36 comparatively thinly. When providing the thin protrusion parts 31-36, as shown in FIG. 6, the protrusion parts 31-36 located in the side part edge 15 become a free end except the part which continues to the side part back surface 12a. The elastic deformation is slightly possible due to the action of external force (see FIG. 6A). In this kind of form, when the vicinity of the side surface edge 15 of the protrusions 31 to 36 is elastically deformed, the virtual inner diameter by the protrusions 31 to 36 is expanded, and the press-fitting direction of the column P is guided. (See FIG. 6B). Then, after the press-in of the support P, the restoring force of the deformed protrusions 31 to 36 acts on the surface of the support P, and the adhesion with the support outer surface Pb can be compensated.

  Describing how to use each of the above-described forms, as shown in FIG. 7, by pressing the cap 1 from above the support P, by allowing the press-up of the support upper end Pa to the inside of the cap 1, The cap 1 can be mounted while the side surface portion 12 is in contact with the outer surface Pb of the support column. At this time, in addition to being able to press the cap 1 linearly against the support P (see FIG. 7A), there is a method of mounting the cap 1 by pressing it while rotating like a male screw ( (Refer FIG.7 (b)). The method of mounting while rotating allows the press-fitting of the tip of the column P while deforming the projecting portions 31 to 36 provided on the side surface portion 12a of the cap 1 in a certain direction. That is, when the protrusions 31 to 36 come into contact with the surface of the column P by rotating the cap 1, the tips of the projections 31 to 36 are deformed in the direction opposite to the rotation direction, and the insertion of the column P is inserted. Can be made easier.

  Next, a second embodiment according to the support cap will be described. In the present embodiment, as shown in FIG. 8A, ribs 121 to 126 are provided on the back surface 111 a of the upper surface of the cap 101, and grooves 131 to 136 are provided on the back surface 112 a of the side surface. The ribs 121 to 126 are provided only in a range from approximately the center 113 of the upper surface back surface 111a to the boundary (upper surface periphery) 114 with the side surface portion 112, and projecting at the boundary (upper surface periphery) 114 of the ribs 121 to 126. The end functions as an abutting portion that abuts on the upper end of the column P.

  The grooves 131 to 136 are provided in a range from the side surface edge 115 to the boundary 114. The front end at the boundary 114 of the grooves 131 to 136 is provided to a position closer to the upper surface back surface 111a than the protruding end at the boundary 114 of the ribs 121 to 126, while the front end at the side surface edge 115 is the side surface edge. 115 is provided to reach 115.

  According to such a configuration, as shown in FIG. 8B, the cap 101 is in relation to the support column P. The protruding ends 121a and 122a of the ribs 121 to 126 abut against the upper end edge Pa of the support column P, and Pa is positioned below the boundary 114 between the upper surface portion 111 and the side surface portion 112 of the cap 101. As a result, there is a gap between the upper surface portion rear surface 111a of the cap 101 and the column upper end Pa so that the ribs 121 to 126 protrude. On the other hand, since the tip of the groove portions 131 to 136 at the boundary 114 is positioned above the column upper end Pa, the upper ends of the groove portions 131 to 136 are opened inside the cap 101 above the column upper end Pa. It has become.

  Accordingly, when the cap 101 is attached to the support P, the side surface rear surface 112a comes into close contact with the support outer surface Pb as shown in FIG. And the said groove parts 131-136 comprise the hole connected in the middle of the side part 112 and the support | pillar outer surface Pb. And the front-end | tip part in the side part edge 115 is opened in the said side part edge 115, and the front-end | tip part in the boundary 114 opens above the support | pillar upper end Pa inside the cap 101. FIG. Thereby, the ventilation | gas_flowing part connected to the inside and the exterior of the support | pillar P will be formed. Accordingly, the internal air of the column P is sucked and exhausted through the vents (grooves 131 to 136), and can cope with expansion or contraction of the internal air.

  In the present embodiment, it is possible to configure the column contact portions 121a to 126a in which the tips at the boundaries 114 of the ribs 121 to 126 are horizontal. As shown in FIG. 9B, a part of the contact portions 121a to 126a is provided across the side surface portion back surface 112a. By providing such contact portions 121a to 126a, when the cap 101 is attached to the support column P, the contact portions 121a to 126a contact the entire circumference of the support column upper end Pa. 111 can be adjusted to a predetermined height, and a gap between the upper surface rear surface 111a and the column upper end Pa can be formed reliably. At the same time, an opening at the boundary 114 of the grooves 131 to 136 is ensured.

  The embodiment of the invention relating to the cap for the support is as described above, but various modes can be taken without departing from the spirit of the present invention. For example, in the said embodiment, although only the small thing is illustrated about the thickness of the protrusion parts 31-36 and the width dimension of the groove parts 131-136, it is possible to make these extremely large. . In this case, it is also possible to increase the thickness of the protrusions 31 to 36 and configure the portions where the protrusions 31 to 36 do not exist as the groove parts 131 to 136. In this case, as shown to Fig.10 (a), the protrusion parts 31-36 are comprised continuously from the ribs 21-26, and the groove parts 131-136 are formed in the part in which the protrusion parts 31-36 do not exist. It becomes. At this time, the surfaces of the protruding portions 31 to 36 function as the side surface portion back surface 112a.

  When the cap 201 configured in this manner is attached to the support P, a ventilation portion similar to that of the first embodiment is formed as shown in FIG. That is, the upper end Pa of the support P is in contact with the ribs 21 to 26 to form a gap with the upper surface rear surface 11a, and the protrusions 31 to 36 are in contact with the outer surface Pb of the support P, thereby causing the groove 131. ~ 136 will form a ventilation part.

  Furthermore, as another modified example, as shown in FIG. 11, there is a configuration in which the shapes of the protruding portions 31 to 36 are changed. The protrusions 31 to 36 are formed by reducing the protrusion height in the vicinity of the side surface edge 15 and are formed by forming the protrusion side edges of the protrusions 31 to 36 in an oblique shape. As an example of such a configuration, the cross-sectional shape shown in FIG. By setting it as the said structure, the press injection of the support | pillar P can be guided, without allowing the deformation | transformation of the front-end | tip part of the protrusion parts 31-36.

  In each of the above embodiments, since the column P is assumed to be cylindrical, the edges of the caps 1 and 101 (upper edge of the upper surface and the edge of the side surface) are circular. Although described and illustrated, in the case where the support column P is formed of a cylindrical body having a different shape such as a quadrangular cylindrical shape, caps 1 and 101 having shapes matching these are provided.

  Examples of the present invention will be described. As an example, the thickness of the upper surface portion 11 of the embodiment shown in FIG. 4 is changed (FIG. 5). The ribs 21 to 26 are provided on the rear surface 11a of the substantially spherical upper surface portion 11 and the side surfaces are formed. The back surface 12 a of the part 12 has a configuration in which protrusions 31 to 36 are provided. The thickness of the upper surface portion 11 is 2.5 mm with the center 13 being the thickest and the thickness of the peripheral portion 1.5 mm, and the whole is integrally molded with silicon resin.

  Therefore, for this example, a strength test was performed on the cap 1 having a diameter of 140 mm on the upper surface portion 11 (specifically, a cap to be attached to the external dimension 140 mm of the support column P). The test method uses an autograph AG-10TE manufactured by Shimadzu Corporation, and the cap 1 is set on a flat table, and the center 13 of the upper surface portion 11 is pressed from above at a pushing speed of 1 mm / min. The deformation state of the part 11 was considered. In the experiment, three caps were tested for the cap 1 of the above example and existing caps used for struts of the same size, and the average of them was graphed.

  In addition, the existing cap is a cap having the same spherical upper surface portion as the cap of the embodiment, and the entire thickness of the upper surface portion is 1.5 mm, and the ribs 21 to 26 and the protruding portions 31 to 36 are None of them.

  The experimental results are shown in Table 1. In Table 1, “AGM” is the cap of the embodiment, and “current product” is the existing cap.

  From the experimental results as described above, the indentation strength of the existing cap is 200 (N) at the maximum, while the indentation strength of the cap of the example is about 550 (N) at the maximum. It was found that the strength was 2.5 times or more.

  Thus, in the cap of the embodiment, a cap having high strength can be configured by the thickness of the upper surface portion 11 and the presence of the ribs 21 to 26. And it can be expected that the strength of the cap can be improved by either a configuration in which the thickness of the upper surface portion 11 is changed or a configuration in which the ribs 21 to 26 are provided.

It is explanatory drawing which shows the state of the cap used for the support | pillar of a protection fence. (A) is a perspective view which shows 1st embodiment of this invention, (b) is IIB-IIB sectional drawing in Fig.2 (a). It is sectional drawing which shows the modification of 1st embodiment. (A) is a perspective view which shows the modification of 1st embodiment, (b) is IVB-IVB sectional drawing in Fig.4 (a). (A) is explanatory drawing which shows the structural example of a protrusion part, (b) is the further modification of 1st embodiment. (A) is explanatory drawing which shows the modification of a protrusion part, (b) is explanatory drawing which shows the relationship with a support | pillar. It is explanatory drawing which shows the usage condition of 1st embodiment. (A) is a perspective view which shows 2nd embodiment of this invention, (b) is a VIIIB-VIIIB sectional drawing in Fig.6 (a). (A) is explanatory drawing which shows the relationship between a support | pillar and a cap, (b) is explanatory drawing which shows the state of a support | pillar contact part. It is explanatory drawing which shows other embodiment. It is explanatory drawing which shows other embodiment.

Explanation of symbols

1, 101, 201 Cap 11, 111 Upper surface portion 11a, 111a Upper surface rear surface 12, 112 Side surface portion 12a, 112a Side surface rear surface 13, 113 Upper surface portion center 14, 114 Periphery (boundary between upper surface portion and side surface portion)
15, 115 Side surface edge 21, 22, 23, 24, 25, 26, 121, 122, 123, 124, 125, 126 Rib 31, 32, 33, 34, 35, 36, 131, 132, 133, 134 , 135, 136 Protruding portions 121a, 122a, 123a, 124a, 125a, 126a Prop contact portions (protruding ends of ribs)
G Guardrail P Column Pa Column upper end Pb Column outer surface

Claims (4)

A synthetic resin support cap made up of an upper surface portion that closes the upper end of the cylindrical support column that supports the protective fence and an annular side surface portion that is attached to the outer peripheral surface near the upper end of the support column. A protective fence post cap comprising a plurality of ribs having a predetermined height while radiating from the vicinity of the center of the back surface of the upper surface portion toward the periphery. 2. The protective fence support cap according to claim 1, wherein the upper surface portion is an upper surface portion that gradually changes in thickness from the vicinity of the center toward the periphery, and becomes thicker in the vicinity of the center than the periphery. The protective fence post cap according to claim 1 or 2, further comprising a protrusion having an appropriate length and a protrusion height and / or at least one groove on the back surface of the side surface. 4. The protective fence post cap according to claim 1, wherein the synthetic resin is a fluororesin.

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